Sand tempering machine



RIE. BRIGGs 1,838,805 SANDv T'EMPERING MACHINE Filed oci. 5. 1927 2Sheets-sheet l Dec.4 29, 1931.

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Dec@ 29, 1981. R. E. BRIGGS 1,838,805

SAND TEMPERING MACHINE Filed Oct, 5. 1927 2 Sheets-Sheet 2 Eig.

mwgwj UNITED STATES,

Patented Dec. 29, 1931 f PATENT OFFICE i ROBERT E. BBIGGS, OF COLUMBUS,OHIO, ASSIGNOR To THF JEFFREY MANUFACTURING COMPANY, OF COLUMBUS,0HIO,VA CORPORATION oF OHIO when,V poured into thermold.

SAND TFMBFBING MACHINE Application ld October 5,1927. SeriallNo.224,231uV 4,The present invention relates to cert-ain new and usefulimprovements in sand tempering machines` of the type adapted for thepreparation ofgfoundry sand. v

,lnfoundry practice molds are ,made of sand and suitable bondingmaterial mixed together with enough moisture to render the masssufficiently cohesive to'. give to the mold the necessary mechanicalstrength. This mixture must be of uniform texture and sufficientlyporous to permit, the escape of the igases generated by the Amolten.metal Y In -quantity production foundries where lthe processes ofmolding and casting are continuous, the

molds are broken up as soon as the metal is vsufficiently chilled. Thesand is then collected.` and :such ingredients added as are necessary tomaintain its character. These-ingredients must be thoroughlyincorporated, sufficiently cooled toretain the desired moisture, andstirred andaerated to produce the desiredA porosity. tion is known intheV trade as sand temperlng. t

heespecial object of this invention isto provide an eicient mechanismfor tempering the sand While transporting it to the molding oor. f v i`The means wherebyl attain this obj ect are fully set forth in thefollowing specification and illustrated' in the accompanying drawings ofwhich i Fig. lis a'fragmentary plan vlewfof a -sand tempering machinelconstructed in accordance with/my present invention...

Fig. 2 is aside `elevation ofthe machine illustrated in` Fig. y1.

Fig. 3 is a transverse sectional view taken along the line III- III ofFig. 1.

-- Fig.V 2l' is a transverse sectional view taken 'alongV theline.IV---IV'of-Fig.l 1.v view taken*` p Figi `is, a .transversesectional along the line V-V of Fig. 1.

, Fig. 6 is fa' fragmentary plan viewon-an .enlargedscale ofthe devicesAillustrated in VFigs/landY 5. ,t i t Fig. 7' is a longitudinalsectionalviewtaken along the line VIIe-VII of Fig. '6.

" 'Fig'. `8 isa transverse sectional view illus- This process ofpreparatrating a modification of the devices illus- Fig.y 9 is afragmentary plan viewof the devices illustrated in Fig.` 8. .i .Y

Like numerals refer to similar parts in the several figures.` I

Y In the.;drawingsl I have illustratedfone Vembodiment of my inventioncomprising `an elongated trough along whichV 4the, foundry sand may bepropelled fr om the mixing floor,

or` other source of supply, to ,theI molding floor orother points atwhich the sand will be used, andin. which the sand will bethoroughlykneaded, aerated, cooled, stirred andV mixed to render it suitable forthe formation of vfour'idry molds. Thistrough consists of abottom plate1 along Vthe lateral edges of which are securely fixed two channel barsi 2 which ,serve as the side walls of the Vtrough andasthe main framefor the` machine. PO-

sitioned in the central, longitudinal,A vertical plane of--this trough,and extending-from` end to end thereof, is av rod 3 which fOrrii gidityand lightnessis preferably formed of a steel tubing. Clamped to the rod3 by the clamping members 4 at spaced intervals along its length, aretransversely extending axle vbars 5 each of Awhich is providedwith twoflange rollers 6 adapted to engage and roll upon the upper-surfaceofthe. channel bars 2 to movably support the rod 3 thereon, and .therebyform a carriage.`

Means are provided forimparting recipjrocatory movement to the` rod 3longitudinally of theitroughfby` an 'actuating `mechr .anisnr comprisingal connecting rod' 7one vend of which engages a wristpin 8A attached to-the rod 3v by'a clamping member` 9 and the other end engages the'crankpin 10 fixed toV a gear wheel `11. The gear wheel-11 is attached Vvto avpowershaft12`journaled in bearings 13 of they supporting frame work. Thegear Wheel A11 is engagedby a. spur pinion 14 "which is xed to thecounter- 'shaft The jcountershaft 15 `also carries a spur gear 1 6'which is `engaged by an armature'pinion 17 of th'emotor 18.V

The motor 18 may be of anyV preferred-j type suitable to the'con'ditionsunder which the n'nachine operates. -For purposes of' along. the' troughillustration I have here shown an electric motor which may receive itsactuating current from any suitable and convenient source, and which maybe controlled by any preferred means, but as such devices are wellunderstood in the art their illustration and description is not thoughtto be required at this time. Guide bars 19 supported in spacedparallelism above the channel bars 2 engage the supporting rollers 6adjacent the wrist pin 8 to maintain their contact with the channel bars2 and thereby insure smoothness of operation.

Clamped to the rod 3 in longitudinally spaced relation are a pluralityof raking devices 20 each having downwardly projecting fingers 21extending into close proximity withthe bottom plate 1 of the trough, andadapted to engage and stir loose material lying upon saidv bottom plate.YPivotally supported by lugs 22 formed on the forward side of the rakingdevices 20 are-scraper plates23 adapted, as the Vrods move rearwardly,to swing away from the lingers 21 and to slide over the material lyingupon the bottom plate 1 and by that sliding movement to smooth down andcompact said material. As the rods 3 move forwardly the plates-28-swinginto Contact with the fingers 21 and are held rigid thereby to act asscrapers by which the material is propelled along the' conveyor trough.

Positioned within the trough, intermediate certain of the rakingdevices, as illustrated in Figs. 5 and 6, are rollers 24 having gudgeonsjournaled in suitable bearings 25 formed on links 2G-which are pivotallyattached to cross-arms 27 clamped to the rods 3. As the rod 3reciprocates longitudinally of the trough the rollers 24 pass over thematerial lying upon the bottom plate 1- crushing the lumps andcompacting the mass to more thoroughly incorporate the ingredientsthereof;

Under so-me circumstances greater weight is required to satisfactorilycompact the ma.- terial under treatment in the trough than. can besecured with rollers such las are illustrated in Figs. 5 and 6. To metsuch requirements I1 have provided an alternative construction which isillustrated in Figs. 8 and 9, wherein two rollers 2S of relatively largediameter are positioned one at each side of the reciprocating rod 3.These rollers are journaled upon an axle 29 which is formed integralwith a connecting lilik pivotally attached to the clamping memberlsecured to thereciprocating rod 3.

In the operation of the machine the several ingredients necessary to theproduction of molding sand are placed within the trough at its receivingend, and are propelled longitudinally thereof by the action of thepivoted scraper Hight: 23. During their progress these ingredients arethoroughly stirred together by the fingers 21, and lneaded by theretrograde movement of the scraper flight 23 and by the rollers 24 tothe end that when discharged at the delivery end of the trough theyconst itute a homogeneous mass of material suitable for the productionof foundry mold.

It is to be understood that I do not limit myself to the preciseconstruction here illustrated and described, since'it is obvious thatwide variation may be made as to details without departure from thespirit of my invention.

lVhatI claim is:

1. In a sand tempering machine, the combination with an elongatedtrough, of a plurality of stirring devices reciprocably. movablelongitudinally of the trough and adapted to disintegrate and stirfmaterial upon the bottom of said trough, devices associated Vwith saidstirring devices adapted alternately to compact said material and topropel'it longitudinally ot' said trough, and rollers associated withsaid device and movable in said trough to compress the materialy 2. In asand tempering machine, the combination with an elongated trough, of aplurality of rakes reciprocably movable longitudinally of said troughadapted to disintegrate and stir materials upon the bottomv of? saidtrough, plates hinged to said rakes adapted whenmoving in one directionto compact said material and when moving inthe opposite direction topropel said materiallongitudinally of the trough, and rollers associatedwith said rakes and movable in Vsaid trough to compress the material.

3. In a sand tempering machine, the combination with an elongatedtrough, of rakes reciprocably movable longitudinally of said troughadaptedto disintegrate and stir materia-ls upon the bottom of saidtrough, plates hinged to said rakes adapted whenmoving in one directionto propel material longitudinally ofthe trough, and rollers positionedintermediate said rakes and movable therewith adapted to compressmaterials uponthe bottom of the trough as and for the purposeset forth.

4. In a sand tempering machine, `the combination with an elongatedtrough, of a plurality of stirring devices reciprocably movablelongitudinally of the troughand adapted to stir and propel materialalong the bottom of the trough and rollers-positionedfintermediate saidstirring devices and movable therewith adaptedto compresssaidmaterialupon the bottom ofthe trough'as and for the purpose set forth. Y

5. In a sand temperingmaehine, the combination with a trough,reciprocatory means, a raking device associated therewith and eX-tending' into said trough, and a propelling plate hingedly connected tolsaidI reciprocatory. means for'swingingmoveinent in one direction ofsaid reciprocatory means, and for abutment with said raking device uponmovement of said reciprocatory means in the opposite direction.

6. In a sand'tempering machine, the combination With a trough, a memberreciprocably mounted above said trough, means carried by said member forpropelling material longitudinally through said trough, a raking deviceconnected to said member and operated in said trough to stir thematerial, and a roller hingedly connected to said reciprocatory memberfor compacting said material in said trough. Y

7 In a sand tempering machine, the combination With a trough,reciprocating means for moving material longitudinally through saidtrough, rakes associated With said means for stirring material in thetrough, and rollers movably associated with said means for compactingthe material in the trough.

8. In a sand tempering machine, the combination With a trough,reciprocatory means for moving material longitudinally Vof said trough,rakes associated With said means for stirring material in said trough,and rollers movably associated with said means for com# pacting thematerial in the trough as it is moved along the trough.

9. In a sand temperingmachine, the combination with a trough,reciprocatory means for moving material longitudinally through saidtrough, rakes associated'with said means Y for stirring material in thetrough, and freely vertically movable rollers movable with said meansfor compactingy the material in the trough.

l0. In a sand tempering machine, the combination With a trough,reciprocatory means for moving Amaterial longitudinally through thesame, rakes associated with said means for stirring material in thetrough, an inclinedv link pivotally connected to said reciprocatorymeans, and a roller carried by said link tov travel in said trough overthe material.

l1. In a sand tempering machine, the combination with a trough,reciprocatory means for moving material longitudinally through the same,and a roller pivotally connected toV Y Y said reciprocating means andoperating in said trough to compact material therein.

In testimony whereof, I have hereunto set my hand. Y

Y ROBERT E. BRIGrGrS.v

